Hewas helping his mother with housework when I called him at 6o'clock last evening．题目和参考答案——青夏教育精英家教网——

题目内容

12．Hewas helping（help） his mother with housework when I called him at 6o'clock last evening．

分析昨天晚上六点我打电话给他的时候他正在帮他的妈妈做家务．

解答答案：was helping．
这里是when引导的时间状语从句，主句的动作和从句的动作同时发生，从句是一般过去时called，主句用过去进行时，过去进行时的构成是was/were+doing，主语是he三单，故用was helping．

点评分析句子判断出正确的时态，再根据语法即可．

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